• 한국군사과학기술학회지
• /
• 제12권1호
• /
• pp.97-105
• /
• 2009

In this paper, the performance of AP(Alternating Projection) and EM(Expectation Maximization) algorithms is investigated in terms of detection of multiple signals, resolvability of coherent signals and the efficiency of sensor array processing. The basic idea of these algorithms is utilization of relaxation technique of successive 1D maximization to solve a direction finding problem by maximizing the multidimensional likelihood function. It means that the function is maximized over only for a single parameter while the other parameters are fixed at each step of the iteration. According to simulation results, the algorithms showed good performance for both incoherent and coherent multiple signals. Moreover, some advantages are identified for direction finding with very small samples and fast convergence. The performance of AP algorithm is compared with that of EM using multiple criteria such as the number of sensor, SNR, the number of samples, and convergence speed over uniform circular array. It is resulted AP algorithm is superior to EM overally except for one criterion, convergence speed. Especially, for EM algorithm there is no performance difference between incoherent and coherent case. In conclusion, AP and EM are viable and practical alternatives, which can be applied to a direction under due to the resolvability of multi-path signals, reliable performance and no troublesome eigen-decomposition of the sample-covariance matrix.

• 한국군사과학기술학회지
• /
• 제7권1호
• /
• pp.34-46
• /
• 2004

Copper films were prepared by using ECR-MOCVD(Electron Cyclotron Resonance Metal Organic Chemical Vapor Deposition) coupled with a DC bias system. The DC bias is connected to the electrode which placed 1∼3cm above the polymer substrate. The pulse electrical field around the electrode attracts the positive charged copper ions generated from the dissociation of copper precursor, $Cu(hfac)_2$, under ECR plasma. Condensation of supersaturated copper ions in the space between the electrode and substrate, makes it possible to deposit copper film on the polymer substrate even at room temperature. In this study, optimization of the electrode configuration was carried out in order to obtain the uniform films. The uniformity of the deposited films were closely related to the parameters of electrode geometry such as electrode shape, thickness, grid size and the spacing between electrodes. The most uniform copper film was observed with the electrode that enabled uniform electrical field distribution across the whole dimension of electrode.

• 한국의류학회지
• /
• 제46권5호
• /
• pp.910-926
• /
• 2022

Suitability for the human body, freedom to move and thermal insulation are important design considerations in military clothing. This study investigates the performance and wearer-satisfaction of the functional inner winter uniform currently used in Korea; it is hoped that our data can inform the development of a future version. Interviews were conducted, in which the participants suggested various improvements. The uniforms were mainly worn for guard duty or as daily attire in cold weather. The participants chose how many layers to wear according to the current situation, rather than sticking to the layering recommended in the manual. Layering choices did not significantly affect combat efficiency but were found to affect wearers' comfort. Wearers' satisfaction was found to depend on the convenience of the clothing, whether it was in the appropriate size, freedom to move and thermal insulation. Also, this study suggests a problem with the current size system, as the analysis of size distribution, across all sizes, the range of current production is insufficient to cover the demand.

• 한국의류학회지
• /
• 제45권6호
• /
• pp.1004-1016
• /
• 2021

This study aims to derive the design requirements for functional clothing worn with military wearable robots using a survey of people with military experience. Specifically, 982 adult males with military and muscular exercise experience were surveyed for their demands for the clothing worn with wearable robots during military activities. The study showed that it is necessary to develop functional clothing worn inside robots suitable for frequent movements of soldiers to improve their comfort level of wearable robots. The surveyed soldiers indicated that they preferred the top and bottom clothing with high-pressure levels because the upper body felt fatigued during transportation, while both the upper and lower body got exhausted during marches. The survey of design requirements revealed that the participants preferred a top with long sleeves and a bottom with ankle-length leggings in color similar to current military uniforms. We conclude that it is important to design functional clothing worn inside wearable robots in different forms depending on frequent movements, e.g., with differentiated pressures and material placements.

• 패션비즈니스
• /
• 제6권3호
• /
• pp.15-27
• /
• 2002

A uniform is generated in the course of confirming a singular mode of dress that is adopted by a community for a specific purpose. In particular, women's uniform has a close relations to their position in the community they belong to. And women's uniform has closely been associated with finding ways into their communities over the centuries, and is part of women's development process. Women's history of using organized uniforms has not been longer than men's. Their realm of activities began to be enlarged due to the World War, and women's uniform has gradually settled down and moved toward diversity. The origin of many uniforms worn by today's women can be traced back to the end of the last century, and this fact indicates that women started to find their ways into many new fields at that time. There has been a lot of changes until current women's uniforms come out. It's intended in this study to contribute to designing more creative and productive women's uniform, by taking a careful look at typical early uniforms for service personnels, nannies, nurses and soldiers that are an indication of their work and working environment.

• 복식문화연구
• /
• 제18권5호
• /
• pp.960-976
• /
• 2010

Even though Joseon Dynasty strictly identified between military and civil officials, the dress and its ornament have been studied only based on embroidery emblems that are correctly identified between military and civil officials. Thus, this study intends to research the features of the only military officials uniform, Cheollik, different from the civil officials's identifying them with other features shown from the records, unearthed relics, stone statue, Joseon-tongsinsa-haengnyeoldo(Illustration of Joseon Delegation to Japan), etc., and its results are as follows: First, for wearing examples of the military officials, from the facts that they had worn mainly ordinary clothes, etc. on announcement of military service examination. There was no difference between military and civil officials's clothes by Daejeonhusokrok and the other documents, and there was an assertion that the form of the military and civil officials's clothes should be different by the document, Hongjejeonseo, in the latter term of the Joseon Dynasty. It is presumed that length, width and shape of sleeves might have been different. Second, unearthed Cheollik of the military officials are mostly from the 16th~17th centuries and most of them have removable sleeves according to statistics. The skirt had an opening and one or two slits. Various textiles were used. Third, military official statues of high governor wear small caps and helmets. They wear Cheollik with the collars same as the collar of Bangryeong and Jikryeong, which is also called Dopji Cheollik. It would be considered as they wear the Bangryeong on top of the Cheollik. Fourth, militarly officials described on the Joseon-tongsinsa-haengnyeoldo(Illustration of Joseon Delegation to Japan) wear Cheollik, Rip, Donggae, Okro, Hongsadae, Hwando, Deungchae.

• 한국염색가공학회:학술대회논문집
• /
• 한국염색가공학회 2010년도 제3회 국제학회
• /
• pp.195-196
• /
• 2010

• 한국군사과학기술학회지
• /
• 제15권3호
• /
• pp.257-265
• /
• 2012

This paper presents a study on characteristics of precession motion of a smart munition. It's a kind of the Sensor Fuzed Weapon. The particular thing for the smart munition is that it has precession motion in the air while the sensor is searching the ground to detect ground vehicles such as tanks. The smart munition has a cylindrical shape and has a sensor attached on its side. Due to its non-uniform mass distribution, its center of gravity(CG) is located away from the center of volume(CV). In order for the smart munition to detect the target effectively, the ground searching pattern of sensor should have an uniform circular form, and for this, the precession motion of smart munition should be in its steady-state. Finally, it is necessary to choose the right initial conditions at the moment of firing, for the steady-state precession motion during flight.

• 한국군사과학기술학회지
• /
• 제14권5호
• /
• pp.859-870
• /
• 2011

The purpose of this paper is to develop reliability analysis procedures for repairable systems with interval failure time data and apply the procedures for assessing the storage reliability of a subsystem of a certain type of guided missile. In the procedures, the interval failure time data are converted to pseudo failure times using the uniform random generation method, mid-point method or equispaced intervals method. Then, such analytic trend tests as Laplace, Lewis-Robinson, Pair-wise Comparison Nonparametric tests are used to determine whether the failure process follows a renewal or non-renewal process. Monte Carlo simulation experiments are conducted to compare the three conversion methods in terms of the statistical performance for each trend test when the underlying process is homogeneous Poisson, renewal, or non-homogeneous Poisson. The simulation results show that the uniform random generation method is best among the three. These results are applied to actual field data collected for a subsystem of a certain type of guided missile to identify its failure process and to estimate its mean time to failure and annual mean repair cost.

• 한국의류산업학회지
• /
• 제10권2호
• /
• pp.138-146
• /
• 2008

Opera costumes are a tangible medium to directly affect how opera singers performed. Therefore, stage costumes have been designed in various ways to reflect intentions of directors. This study examines modernization of opera costumes. For this study, the author worked as one of costume design staff for "Faust" which was played in Sung-Nam Art Center from November 24, 2005 to November 27, 2005 in commemoration of the opening of the center. The following outcomes of the supporting actors are drawn from this study. Martha wore a grey jacket and a long skirt with slash. Grey suit symbolized chastity but tight long skirt with slash means sexy. Valentin wore military and combat uniforms to express that he was a soldier. The military uniform represented the situation before the war and the combat uniform symbolized the situation after the war. Rather short trousers, a white tweed jacket, purple flower ornament, a light green vest, and a beret were used to express Wagner, who looked ridiculous and always tried to flirt. Overalls, a blue jumper, and a scarlet baseball cap were used to make Siebel look naive and homely. Modern opera costumes now help reduce the time and space between stage and audience, improve economic efficiency and meet the audience's needs for various style.